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Key points for wet film application on circuit boards
1.Brushing boards The materials provided by the previous process (i.e. production boards) are required to have no serious oxidation, oil stains, or wrinkles on the board surface. We use pickling (5% sulfuric acid) spraying to remove organic impurities and inorganic dirt, and then use a 500-mesh nylon brush roller to brush. After brushing the board,…
